CN214115300U - Zero-discharge and comprehensive utilization production system for domestic wastewater in water-deficient area - Google Patents
Zero-discharge and comprehensive utilization production system for domestic wastewater in water-deficient area Download PDFInfo
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- CN214115300U CN214115300U CN202023308216.4U CN202023308216U CN214115300U CN 214115300 U CN214115300 U CN 214115300U CN 202023308216 U CN202023308216 U CN 202023308216U CN 214115300 U CN214115300 U CN 214115300U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The utility model discloses a zero discharge and comprehensive utilization production system for domestic wastewater in water-deficient areas, which comprises a hydrolysis regulating tank, a primary aerobic tank, an anoxic tank, a secondary aerobic tank, a secondary sedimentation tank and a clean water tank which are sequentially connected on a main pipeline; a mechanical grid is arranged in front of a water inlet of the hydrolysis regulating tank, and the domestic sewage enters the hydrolysis regulating tank for hydrolysis reaction after being intercepted and filtered; the bottom of the primary aerobic tank flows back to the hydrolysis adjusting tank through a digestive juice return pipe; the middle part of the secondary sedimentation tank returns to the secondary aerobic tank through a digestive juice return pipe, the top part of the secondary sedimentation tank is connected to the clear water tank through an overflow pipe, and the bottom part of the secondary sedimentation tank is connected to the sludge tank through a sludge pipe; sludge generated at the bottom of the sludge tank is pumped to a filter press for dehydration, and the discharged wastewater returns to the hydrolysis regulating tank for retreatment.
Description
Technical Field
The utility model belongs to water resource utilization and environmental protection field, concretely relates to zero release of domestic waste water and comprehensive utilization production system in water-deficient area.
Background
At present, most of wastewater generated in domestic living areas is treated by a septic tank based on precipitation and anaerobic fermentation principles to remove suspended organic matters in domestic sewage and is discharged to a municipal domestic sewage pipe network, or is treated by a biochemical treatment device AO, AAO and MBR after being simply treated by the septic tank and is discharged to the municipal domestic sewage pipe network or is subjected to plant greening and the like.
In arid areas with water resources being poor and high, municipal supporting facilities are seriously insufficient. In order to implement various national environmental protection policies, enterprises should establish sound respective three-waste treatment devices under the premise of meeting laws and regulations to achieve legal and compliant operation.
Therefore, by combining the practical situations of the living areas and the production process, the development of a domestic wastewater water-saving production process suitable for the living areas in the remote areas and the areas short of water resources is urgently needed, and meanwhile, the comprehensive wastewater treatment and water resource recycling device is matched, so that the water resources are recycled to the maximum extent, the water intake is reduced, and the water cost of the living areas in the remote areas is reduced.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a for being suitable for the requirement of each enterprise's life and production process in remote water-deficient area, reduce production working costs, combine original waste water treatment technology to carry out process flow's expansion, optimize living area and whole production process, take effectual processing and reasonable branch matter utilization to the waste water that produces in the life, carry out overall design to terminal sewage treatment system and finally reach water resource comprehensive recycle, accomplish really that the zero release of domestic sewage is handled.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a production system for zero discharge and comprehensive utilization of domestic wastewater in water-deficient areas comprises a hydrolysis regulating tank, a primary aerobic tank, an anoxic tank, a secondary aerobic tank, a secondary sedimentation tank and a clean water tank which are sequentially connected on a main pipeline;
a mechanical grid is arranged in front of a water inlet of the hydrolysis regulating tank, and the domestic sewage enters the hydrolysis regulating tank for hydrolysis reaction after being intercepted and filtered;
the bottom of the primary aerobic tank flows back into the hydrolysis adjusting tank through a digestive juice return pipe;
the middle part of the secondary sedimentation tank reflows to the secondary aerobic tank through a digestive juice backflow pipe, the top part of the secondary sedimentation tank is connected to the clear water tank through an overflow pipe, and the bottom part of the secondary sedimentation tank is connected to the sludge tank through a sludge pipe;
and sludge generated at the bottom of the sludge tank is pumped to a filter press for dehydration, and the discharged wastewater returns to the hydrolysis regulating tank for retreatment.
Further, the clean water tank is connected with the high-density tank, and clean water in the clean water tank is discharged into the high-density tank for further treatment;
the high-density pond is sequentially connected with the ultrafiltration system, the water softener, the reverse osmosis system, the EDI system and the desalted water tank through a main pipeline, and finally the obtained desalted water is used as production water to be supplied to each production device;
the bottom of the high-density tank is connected to a sludge concentration tank through a sludge pipe, sludge in the sludge concentration tank is pumped to a filter press for dehydration through a sludge pump, and discharged wastewater returns to the high-density tank for retreatment;
concentrated water generated by the reverse osmosis system is discharged into a concentrated water RO system for further treatment; the water produced by the concentrated water RO system enters a water softener for re-softening, and the concentrated water which is re-concentrated enters a concentrated water to be further treated by a sewage MVR zero discharge system;
and the outlet water of the concentrated water-sewage MVR zero discharge system enters a reverse osmosis system for retreatment.
Specifically, the concentrated water to sewage MVR zero discharge system comprises an evaporation feed chute, a plate heat exchanger, a degassing tower, an MVR evaporator, a crystallization feed tank, a crystallizer, a centrifuge and a dryer which are sequentially connected;
the concentrated water re-concentrated by the concentrated water RO system enters an evaporation feed tank, then is sent to a plate heat exchanger for heat exchange by an evaporation feed pump, then enters a degassing tower for removing dissolved oxygen and other non-condensable gases, and then enters an MVR evaporator; the MVR evaporator sends strong brine to an overflow box at the top of the MVR evaporator through an evaporation circulating pump to form an evaporation circulating system; and the evaporation circulation system sends part of high-salinity water into a crystallization feeding tank through a cyclone flow divider, then the high-salinity water is sent into a circulation loop formed by a crystallization circulating pump and a crystallizer through a crystallization feeding pump, the high-salinity water is flashed in the crystallizer, the generated strong brine is dehydrated through a centrifugal machine and then is separated into solid miscellaneous salt and centrifugal mother liquor, one part of the centrifugal mother liquor is sent into the crystallizer for re-evaporation and crystallization, and the other part of the centrifugal mother liquor is sent to a drying machine through the pump and then is dried, so that the solid miscellaneous salt is obtained.
And further, all secondary steam generated in the MVR evaporator is compressed by a steam compressor, enters the shell side of the evaporator as heating steam of the MVR evaporator, is sent into a plate heat exchanger by a distillate pump to exchange heat with the feeding material after being condensed into water and mixed with crystallization distillate generated by a crystallizer, and condensed water after heat exchange enters a reuse water tank and is sent into a reverse osmosis system to be desalted.
Furthermore, a heater is arranged in a circulation loop formed by the crystallization circulating pump and the crystallizer, primary steam is introduced to heat the high-salt water, and the obtained condensate is pumped into a reverse osmosis system through reuse water to be desalted.
Preferably, steam generated by flash evaporation in the crystallizer is condensed and cooled by an air cooler to form crystallization distillate which is mixed with condensed water generated by an MVR evaporator.
Has the advantages that:
the utility model discloses the system optimizes the improvement to the traditional domestic sewage treatment flow in living area, and the closed cycle of better realization sewage is used, reduces the fresh water quantity, hoisting device treatment effeciency and operation cycle, and domestic sewage passes through evaporation crystallization comprehensive utilization and rates more than 98%, carries out innocent treatment with the solid useless that domestic wastewater produced, and is friendly to the environment, solves the sewage zero release in the lack of water area far away in the true sense.
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These and/or other advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings and the following detailed description.
FIG. 1 is a flow chart of the production system for zero discharge and comprehensive utilization of domestic wastewater in the water-deficient area.
FIG. 2 is a structural diagram of an MVR evaporator in the zero-discharge and comprehensive utilization production system of domestic wastewater in the water-deficient area.
Detailed Description
The invention will be better understood from the following examples.
The drawings in the specification show the structure, ratio, size, etc. only for the purpose of matching with the content disclosed in the specification, so as to be known and read by those skilled in the art, and not for the purpose of limiting the present invention, so the present invention does not have the essential meaning in the art, and any structure modification, ratio relationship change or size adjustment should still fall within the scope covered by the technical content disclosed in the present invention without affecting the function and achievable purpose of the present invention. Meanwhile, the terms "upper", "lower", "front", "rear", "middle", and the like used in the present specification are for the sake of clarity only, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof are also considered to be the scope of the present invention without substantial changes in the technical content.
As shown in fig. 1, the zero-discharge and comprehensive utilization production system for domestic wastewater in water-deficient areas comprises a hydrolysis regulating tank, a primary aerobic tank, an anoxic tank, a secondary aerobic tank, a secondary sedimentation tank and a clean water tank which are sequentially connected with one another on a main pipeline.
A mechanical grid is arranged in front of a water inlet of the hydrolysis adjusting tank, and the domestic sewage enters the hydrolysis adjusting tank for hydrolysis reaction after being intercepted and filtered.
And the bottom of the primary aerobic tank flows back into the hydrolysis adjusting tank through a digestive juice return pipe.
The middle part of the secondary sedimentation tank flows back into the secondary aerobic tank through a digestive juice return pipe, the top part of the secondary sedimentation tank is connected into the clear water tank through an overflow pipe, and the bottom part of the secondary sedimentation tank is connected into the sludge tank through a sludge pipe.
And sludge generated at the bottom of the sludge tank is pumped to a filter press for dehydration, and the discharged wastewater returns to the hydrolysis regulating tank for retreatment.
The clean water tank is connected with the high-density tank, and clean water in the clean water tank is discharged into the high-density tank for further treatment.
The high-density pond is sequentially connected with the ultrafiltration system, the water softener, the reverse osmosis system, the EDI system and the desalted water tank through a main pipeline, and finally the obtained desalted water is used as production water to be supplied to each production device.
The bottom of the high-density tank is connected to a sludge concentration tank through a sludge pipe, sludge in the sludge concentration tank is pumped to a filter press for dehydration through a sludge pump, and discharged wastewater returns to the high-density tank for retreatment.
Concentrated water generated by the reverse osmosis system is discharged into a concentrated water RO system for further treatment; and the produced water of the concentrated water RO system enters a water softener to be softened again, and the concentrated water enters the concentrated water again to a sewage MVR zero discharge system for further treatment.
And the outlet water of the concentrated water-sewage MVR zero discharge system enters a reverse osmosis system for retreatment.
As shown in fig. 2, the MVR zero discharge system from concentrated water to sewage includes an evaporation feed tank, a plate heat exchanger, a degassing tower, an MVR evaporator, a crystallization feed tank, a crystallizer, a centrifuge, and a dryer, which are connected in sequence; the concentrated water re-concentrated by the concentrated water RO system enters an evaporation feed tank, then is sent to a plate heat exchanger for heat exchange by an evaporation feed pump, then enters a degassing tower for removing dissolved oxygen and other non-condensable gases, and then enters an MVR evaporator; the MVR evaporator sends strong brine to an overflow box at the top of the MVR evaporator through an evaporation circulating pump to form an evaporation circulating system; and the evaporation circulation system sends part of high-salinity water into a crystallization feeding tank through a cyclone flow divider, then the high-salinity water is sent into a circulation loop formed by a crystallization circulating pump and a crystallizer through a crystallization feeding pump, the high-salinity water is flashed in the crystallizer, the generated strong brine is dehydrated through a centrifugal machine and then is separated into solid miscellaneous salt and centrifugal mother liquor, one part of the centrifugal mother liquor is sent into the crystallizer for re-evaporation and crystallization, and the other part of the centrifugal mother liquor is sent to a drying machine through the pump and then is dried, so that the solid miscellaneous salt is obtained.
All secondary steam generated in the MVR evaporator is compressed by a steam compressor, enters the shell side of the evaporator as heating steam of the MVR evaporator, is sent into a plate heat exchanger by a distillate pump to exchange heat with feed after being condensed into water and mixed with crystallization distillate generated by a crystallizer, and the condensed water after heat exchange is processed by an activated carbon filter and is sent into a reverse osmosis system to be desalted. And condensing and cooling steam generated by flash evaporation in the crystallizer by an air cooler to form crystallized distillate, and mixing the crystallized distillate with the distillate generated by the MVR evaporator. A heater is arranged in a circulation loop formed by the crystallization circulating pump and the crystallizer, primary steam is introduced to heat the high-salt water, and the obtained steam condensate is pumped into the reverse osmosis system by the reuse water pump to be desalted.
As shown in figure 1, the operation principle of the domestic wastewater zero-discharge and comprehensive utilization production system in the water-deficient area is as follows:
the domestic drainage is uniformly overflowed to a domestic wastewater system through a septic tank for treatment. The domestic wastewater system adopts hydrolysis acidification and biochemical treatment processes, and the quality of inlet water is higher than that of domestic conventional domestic wastewater. The pH value of the wastewater is 7.0-7.5, the COD is higher than the conventional design range of 350-500 mg/L, the ammonia nitrogen in the wastewater is also higher than the conventional design value of 35-50 mg/L, the conventional AAO biological reaction is short in residence time, and the effluent of a biochemical treatment system exceeds the standard.
Domestic wastewater is filtered by a mechanical grid and then is introduced into a hydrolysis regulating tank, so that the wastewater is subjected to hydrolysis reaction to remove part of organic pollutants which are easy to degrade, and the organic pollutants which are difficult to degrade can be removedThe macromolecular organic matter is decomposed into simpler micromolecular organic matter. After hydrolysis treatment, the COD of the wastewater is reduced, and the BOD of the wastewater is reduced5Increase BOD5And the COD ratio is improved, the sludge generated at the bottom of the tank is conveyed to a filter press by a sludge pump station, and the discharged wastewater returns to the regulating tank. The wastewater after hydrolysis treatment flows out and enters a first-stage aerobic tank. And part of the wastewater after contact oxidation enters an anoxic tank, a secondary aerobic tank and a secondary sedimentation tank. When the waste water enters the central pipe of the secondary sedimentation tank, the waste water flows into the tank from the lower part and flows from bottom to top, the clarified treated water overflows from the upper part of the tank, the quality of the effluent water of the waste water reaches and is superior to the requirement of national first-class A discharge standard, and the part of clear water is preferentially used for greening in summer in principle. The clear water treated by the domestic wastewater treatment device contains various impurities, such as suspended matters, colloids, organic matters, inorganic salts and the like, and in order to ensure the normal operation of a reverse osmosis part in a desalination water system, the suspended matters, the colloids, the organic matters and the like in the water must be removed firstly, so that the inflow water of the reverse osmosis meets the requirement, and a pretreatment system is added before the domestic wastewater enters a membrane. Biochemical effluent is subjected to reaction coagulation, precipitation and filtration in a high density pond and then enters an ultrafiltration system (model: SFP2860, manufacturer: DOW), ultrafiltration produced water is softened by a water softener (model: F77A3, manufacturer: Wenzhou Runfin) to reduce the hardness and then enters a desalted water reverse osmosis system (model: BW30FR-400/34, manufacturer: DOW), reverse osmosis produced water is conveyed to a desalted water tank through EDI electric desalting (model: E-Cell-3X, manufacturer: GE) and is used for downstream production, ultrafiltration backwashing water is discharged to the front end of the pre-precipitation system to be subjected to reaction, precipitation and filtration again, reverse osmosis concentrated water is treated by a concentrated water RO system (model: BW30FR-400/34, manufacturer: DOW), the produced water is softened again in a water softener, and the concentrated water is further evaporated, concentrated and desalted in a sewage MVR system.
As shown in fig. 2, the operation principle of the MVR zero discharge system from concentrated water to sewage is as follows:
MVR falling film evaporation process flow: the strong brine enters the evaporation feeding tank, is added with medicine to be regulated and stirred, and is sent into a plate heat exchanger (the plate heat exchanger takes distillate of an evaporation and crystallization unit as a heat source) by a feeding pump to carry out heat exchange to the temperature close to the boiling point of the solution (on one hand, the solubility of oxygen and non-condensable gas in water is reduced, on the other hand, the steam load of a degassing tower is reduced, and the operation effect of the degassing tower is ensured). Dissolved oxygen and other non-condensable gases are removed in a degasser (oxygen removal can reduce corrosion of the evaporative crystallization system by chloride ions in high salinity water). The high-salt water after adding medicine, heat exchange and deoxidization enters the evaporator salt water tank. Circulating brine is pumped to the overflow box at the top of the evaporator from the bottom of the evaporator by a circulating pump, a liquid distributor is adopted, high-brine liquid flow is uniformly distributed in each pipe to form a liquid film, the evaporation of the high-brine liquid flow is facilitated by the steam heating part at the shell side, and the high-brine liquid flow is fully subjected to falling film evaporation and heating by a heater to the boiling point temperature and is concentrated at the same time. All secondary steam generated by the evaporator is compressed by the mechanical compressor, and enters the shell side of the evaporator as heating steam of the evaporator after enthalpy is increased, the heating steam is condensed into water to be mixed with crystallization distillate, and is sent into the plate heat exchanger by the evaporation distillate pump to exchange heat with feeding materials, and the MVR evaporation process recovers latent heat of the steam, improves the heat efficiency and reduces the energy consumption. And the condensed water after heat exchange enters a reuse water pool or is sent to a desalted water device to prepare desalted water. If not enough salt species suspend in the salt solution in the evaporation process, salt scale produced by calcium sulfate or silicon dioxide and the like can be rapidly produced on the heat exchange surface of the evaporator, equipment is corroded, the heat transfer efficiency is reduced, the normal operation is influenced, in order to prevent the wall surface of a heat exchange tube of the evaporator from scaling, calcium sulfate is introduced as the salt species, crystals precipitated in the concentrated salt solution are preferentially adsorbed on the surface of the salt species, and the scaling of the corrosion equipment and the heat exchange tube is avoided.
The crystallization process flow comprises the following steps: the evaporation circulation system extracts a part of high-salt water through a rotational flow splitter, the high-salt water enters a crystallization feeding tank with a stirrer, the high-salt water is conveyed to the outlet of a crystallization circulating pump through a crystallization feeding pump, is mixed with circulating slurry of a crystallizer, enters a crystallization heater, is heated to the boiling point temperature, and is sent to the crystallizer for flash evaporation. And condensing and cooling steam generated by flash evaporation by an air cooler, mixing the steam with the evaporation distillate, sending the mixture into a plate heat exchanger to heat feed liquid, and finally pumping the mixture to a desalting device by a reuse water pump to prepare desalted water.
The concentrated salt slurry produced in the crystallization system is separated into solid miscellaneous salt (sodium salt) by a centrifugal dehydrator. Centrifugal mother liquor (main component CaCl)2) Automatically flows into strong brineThe water tank is used for ensuring that strong brine in the equipment is not subjected to solid-liquid sedimentation separation through stirring, and calcium ions in the strong brine are mainly CaCl2The salt is present in a concentration of about 5000-10000 mg/L, and the calcium ions are present in such high concentration except a small amount of CaSO4Most of calcium ions are in CaCl form2The form is continuously concentrated but not crystallized, so a small amount of mother liquor needs to be continuously discharged after the system is operated for a period of time to ensure the normal evaporative crystallization process of the salt solution in the crystallizer. The discharged mother liquor is conveyed to a rotary drum dryer by a pump, liquid phase materials attached to a rotary drum body are dried in a continuous operation mode in a heat conduction mode, the material liquid and a material distribution device form a material film on the outer wall of a heating drum rotating at a certain rotating speed under the action of a small press roller, the material film is heated by the hot drum wall of a heating medium (water vapor) continuously introduced, the material film is scraped by a scraper after being dried, solid miscellaneous salt is conveyed by conveying devices such as a spiral conveying device and the like, and secondary steam is condensed and recycled.
The utility model provides a zero release of lack of water area domestic waste water and comprehensive utilization production system's thinking and method, the method and the way that specifically realize this technical scheme are many, above only the utility model discloses a preferred embodiment should point out, to the ordinary technical personnel of this technical field, not deviating from the utility model discloses under the prerequisite of principle, can also make a plurality of improvements and moist decorations, these improve and moist decorations should also regard as the utility model discloses a protection range. All the components not specified in the present embodiment can be realized by the prior art.
Claims (6)
1. A zero-discharge and comprehensive utilization production system for domestic wastewater in water-deficient areas is characterized by comprising a hydrolysis regulating tank, a primary aerobic tank, an anoxic tank, a secondary aerobic tank, a secondary sedimentation tank and a clean water tank which are sequentially connected on a main pipeline;
a mechanical grid is arranged in front of a water inlet of the hydrolysis regulating tank, and the domestic sewage enters the hydrolysis regulating tank for hydrolysis reaction after being intercepted and filtered;
the bottom of the primary aerobic tank flows back into the hydrolysis adjusting tank through a digestive juice return pipe;
the middle part of the secondary sedimentation tank reflows to the secondary aerobic tank through a digestive juice backflow pipe, the top part of the secondary sedimentation tank is connected to the clear water tank through an overflow pipe, and the bottom part of the secondary sedimentation tank is connected to the sludge tank through a sludge pipe;
and sludge generated at the bottom of the sludge tank is pumped to a filter press for dehydration, and the discharged wastewater returns to the hydrolysis regulating tank for retreatment.
2. The production system for zero discharge and comprehensive utilization of domestic wastewater in the water-deficient area according to claim 1, wherein the clean water tank is connected with the high-density tank, and clean water in the clean water tank is discharged into the high-density tank for further treatment;
the high-density pond is sequentially connected with the ultrafiltration system, the water softener, the reverse osmosis system, the EDI system and the desalted water tank through a main pipeline, and finally the obtained desalted water is used as production water to be supplied to each production device;
the bottom of the high-density tank is connected to a sludge concentration tank through a sludge pipe, sludge in the sludge concentration tank is pumped to a filter press for dehydration through a sludge pump, and discharged wastewater returns to the high-density tank for retreatment;
concentrated water generated by the reverse osmosis system is discharged into a concentrated water RO system for further treatment; the water produced by the concentrated water RO system enters a water softener for re-softening, and the concentrated water which is re-concentrated enters a concentrated water to be further treated by a sewage MVR zero discharge system;
and the outlet water of the concentrated water-sewage MVR zero discharge system enters a reverse osmosis system for retreatment.
3. The zero-discharge and comprehensive utilization production system for domestic wastewater in the water-deficient area according to claim 2, wherein the MVR zero-discharge system for concentrated water to sewage comprises an evaporation feed tank, a plate heat exchanger, a degassing tower, an MVR evaporator, a crystallization feed tank, a crystallizer, a centrifuge and a dryer which are connected in sequence;
the concentrated water re-concentrated by the concentrated water RO system enters an evaporation feed tank, then is sent to a plate heat exchanger for heat exchange by an evaporation feed pump, then enters a degassing tower for removing dissolved oxygen and other non-condensable gases, and then enters an MVR evaporator; the MVR evaporator sends strong brine to an overflow box at the top of the MVR evaporator through an evaporation circulating pump to form an evaporation circulating system; and the evaporation circulation system sends part of high-salinity water into a crystallization feeding tank through a cyclone flow divider, then the high-salinity water is sent into a circulation loop formed by a crystallization circulating pump and a crystallizer through a crystallization feeding pump, the high-salinity water is flashed in the crystallizer, the generated strong brine is dehydrated through a centrifugal machine and then is separated into solid miscellaneous salt and centrifugal mother liquor, one part of the centrifugal mother liquor is sent into the crystallizer for re-evaporation and crystallization, and the other part of the centrifugal mother liquor is sent to a drying machine through the pump and then is dried, so that the solid miscellaneous salt is obtained.
4. The production system for zero discharge and comprehensive utilization of domestic wastewater in water-deficient areas according to claim 3, wherein all secondary steam generated in the MVR evaporator is compressed by a steam compressor, and enters the shell side of the evaporator as heating steam of the MVR evaporator, condensed water is mixed with crystallization distillate generated by a crystallizer, and then is sent to a plate heat exchanger by a distillate pump to exchange heat with feed, and condensed water after heat exchange enters a reuse water tank and is sent to a reverse osmosis system to be desalted.
5. The production system for zero discharge and comprehensive utilization of domestic wastewater in water-deficient areas according to claim 3, wherein a heater is arranged in a circulation loop formed by the crystallization circulation pump and the crystallizer, high-salt water is heated by introducing primary steam, and the obtained condensate is pumped into a reverse osmosis system through reuse water for desalination treatment.
6. The zero-emission and comprehensive utilization production system for domestic wastewater in water-deficient areas according to claim 3, wherein steam generated by flash evaporation in the crystallizer is condensed and cooled by an air cooler to form crystallized distillate, and the crystallized distillate is mixed with condensed water generated by an MVR evaporator.
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